1. ## Solving linear equations.

Hey everyone I need help with doing the working out on these equations:

1) 4a + 5 = 21 + 2a
2) 12 - 3b + 4 = 7
2

3) x3 + 63 = 30
3

2. The first one:

$4a + 5 = 21 + 2a$

(-2a from both sides)

$4a -2a + 5 = 21 +2a - 2a$
$2a + 5 = 21$

(-5 from both sides)

$2a = 16$

(divide by 2 on both sides)
$a = \frac{16}{2} = 8$

You try the rest and show us your working if you get stuck.